Sleepy Hollow Cemetery

Physical/Chemical Data

Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.

Entero Count (fecal indicator) and Rainfall

39 Samples taken

Sample Date [i] Enterococcus Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

QualityRain, day of (in)Prior Day2 Days Prior3 Days Prior Rain4 Days Total Rain
SortSortSortSortSortSortSortSort
10/21/2017158Beach Advisory0.00.00.00.00.0
09/16/20172420Beach Advisory0.00.00.40.00.5
07/15/20172420Beach Advisory0.00.50.40.00.8
06/17/2017689Beach Advisory0.00.20.00.00.2
06/16/20172420Beach Advisory0.00.00.40.00.5
05/20/201764Beach Advisory0.00.00.00.00.0
10/08/2016>2420Beach Advisory0.00.00.00.00.0
09/10/2016549Beach Advisory0.00.00.00.00.0
08/13/2016>2420Beach Advisory0.00.40.00.40.8
07/09/2016727Beach Advisory0.00.00.40.00.4
06/11/20161733Beach Advisory0.00.00.00.30.3
05/14/201626Acceptable0.00.20.00.00.2
10/03/2015>2420Beach Advisory0.40.50.11.32.2
09/05/201524Acceptable0.00.00.00.00.0
08/01/2015111Beach Advisory0.00.00.70.00.7
07/04/2015184Beach Advisory0.00.00.00.60.6
06/06/2015980Beach Advisory0.10.00.00.00.1
05/02/201510Acceptable0.00.00.00.00.0
10/04/2014>2420Beach Advisory0.80.00.00.00.8
09/06/2014461Beach Advisory0.10.00.00.00.1
08/02/2014>2420Beach Advisory0.20.20.00.00.4
07/05/20141414Beach Advisory0.00.11.41.53.0
06/07/201470Beach Advisory0.00.00.50.20.6
05/03/2014126Beach Advisory0.00.00.31.41.7
10/12/2013101Beach Advisory0.00.00.00.00.0
09/14/2013579Beach Advisory0.00.11.70.01.8
08/10/20132420Beach Advisory0.00.30.10.00.4
07/13/20131203Beach Advisory0.00.10.00.20.4
06/15/2013461Beach Advisory0.00.30.70.01.0
05/04/201321Acceptable0.00.00.00.00.0
10/06/2012>2420Beach Advisory0.00.01.20.31.5
09/08/2012238Beach Advisory1.50.00.00.52.0
08/04/2012184Beach Advisory0.00.00.00.10.1
07/14/2012345Beach Advisory0.10.00.00.00.1
06/02/2012>2420Beach Advisory0.90.00.00.01.0
05/12/2012155Beach Advisory0.00.00.30.71.0
11/06/201159Acceptable0.00.00.00.00.0
11/04/2010>2420Beach Advisory1.10.00.00.01.1
06/12/2010687Beach Advisory0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

39 Samples taken

Water Quality*

Acceptable (0–60) Beach Advisory (61+)

*Single sample thresholds;
Enterococcus count per 100mL

Prior Four Day Rainfall
(in inches)

Dry Weather (0–0.25) Wet Weather (0.25+)

Enterococcus is an EPA-approved fecal contamination indicator.

Samples taken by citizen scientists trained by Riverkeeper, and processed on the Riverkeeper vessel, according to the 2014 Quality Assurance Project Plan.

Rainfall data comes from wunderground.com. Wet weather is a common trigger of fecal contamination.

What do the Numbers Mean?

Water Quality scoring is based on the 2012 Recreational Water Quality Criteria from the US Environmental Protection Agency (EPA) for safe swimming. Learn More

About this location:

This site is located at the downstream end of the Sleepy Hollow Cemetery, near Route 9. Upstream of this site, the river flows through a forested buffer that is bounded by the lawns of the cemetery to the west and Douglas Park to the east.

Agencies Responsible:

Westchester County Dept. of Health: 914-813-5000; NYSDEC Region 3: 914-428-2505

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